Choose a background or upload your own photo, then download a shareable quote image.
Choose a background or upload your own photo, then download a shareable quote image.
The Big Bang theory is the idea that if we go back early enough in the history of the universe - and we can do this, of course, by looking at starlight coming to us from billions of years ago - we will see a very hot and dense period where the universe was much smaller, denser, and hotter.